From: Hans-Christian Egtvedt hcegtvedt@atmel.com
The existing code can show information about a gzip compressed BMP image, but can't actually display it.
Therefore, move the decompression code out of bmp_info() and use it in bmp_display() as well in order to display a compressed BMP image.
Also, clean things up a bit and fix a memory leak while we're at it.
[hskinnemoen@atmel.com: a bit of refactoring] Signed-off-by: Haavard Skinnemoen hskinnemoen@atmel.com --- One thing I can't help wondering about: What is the difference between "LCD" and "video"? It seems a bit strange that there are separate functions for displaying a BMP onto basically the same thing, i.e. a framebuffer.
common/cmd_bmp.c | 134 ++++++++++++++++++++++++++++++++++-------------------- 1 files changed, 85 insertions(+), 49 deletions(-)
diff --git a/common/cmd_bmp.c b/common/cmd_bmp.c index 907f9a2..2437e22 100644 --- a/common/cmd_bmp.c +++ b/common/cmd_bmp.c @@ -37,6 +37,62 @@ static int bmp_display (ulong addr, int x, int y); int gunzip(void *, int, unsigned char *, unsigned long *);
/* + * Allocate and decompress a BMP image using gunzip(). + * + * Returns a pointer to the decompressed image data. Must be freed by + * the caller after use. + * + * Returns NULL if decompression failed, or if the decompressed data + * didn't contain a valid BMP signature. + */ +#ifdef CONFIG_VIDEO_BMP_GZIP +static bmp_image_t *gunzip_bmp(unsigned long addr, unsigned long *lenp) +{ + void *dst; + unsigned long len; + bmp_image_t *bmp; + + /* + * Decompress bmp image + */ + len = CFG_VIDEO_LOGO_MAX_SIZE; + dst = malloc(CFG_VIDEO_LOGO_MAX_SIZE); + if (dst == NULL) { + puts("Error: malloc in gunzip failed!\n"); + return NULL; + } + if (gunzip(dst, CFG_VIDEO_LOGO_MAX_SIZE, (uchar *)addr, &len) != 0) { + free(dst); + return NULL; + } + if (len == CFG_VIDEO_LOGO_MAX_SIZE) + puts("Image could be truncated" + " (increase CFG_VIDEO_LOGO_MAX_SIZE)!\n"); + + bmp = dst; + + /* + * Check for bmp mark 'BM' + */ + if (!((bmp->header.signature[0] == 'B') && + (bmp->header.signature[1] == 'M'))) { + free(dst); + return NULL; + } + + puts("Gzipped BMP image detected!\n"); + + return bmp; +} +#else +static bmp_image_t *gunzip_bmp(unsigned long addr) +{ + return NULL; +} +#endif + + +/* * Subroutine: do_bmp * * Description: Handler for 'bmp' command.. @@ -101,63 +157,24 @@ U_BOOT_CMD( static int bmp_info(ulong addr) { bmp_image_t *bmp=(bmp_image_t *)addr; -#ifdef CONFIG_VIDEO_BMP_GZIP - unsigned char *dst = NULL; - ulong len; -#endif /* CONFIG_VIDEO_BMP_GZIP */ + unsigned long len;
if (!((bmp->header.signature[0]=='B') && - (bmp->header.signature[1]=='M'))) { + (bmp->header.signature[1]=='M'))) + bmp = gunzip_bmp(addr, &len);
-#ifdef CONFIG_VIDEO_BMP_GZIP - /* - * Decompress bmp image - */ - len = CFG_VIDEO_LOGO_MAX_SIZE; - dst = malloc(CFG_VIDEO_LOGO_MAX_SIZE); - if (dst == NULL) { - printf("Error: malloc in gunzip failed!\n"); - return(1); - } - if (gunzip(dst, CFG_VIDEO_LOGO_MAX_SIZE, (uchar *)addr, &len) != 0) { - printf("There is no valid bmp file at the given address\n"); - return(1); - } - if (len == CFG_VIDEO_LOGO_MAX_SIZE) { - printf("Image could be truncated (increase CFG_VIDEO_LOGO_MAX_SIZE)!\n"); - } - - /* - * Set addr to decompressed image - */ - bmp = (bmp_image_t *)dst; - - /* - * Check for bmp mark 'BM' - */ - if (!((bmp->header.signature[0] == 'B') && - (bmp->header.signature[1] == 'M'))) { - printf("There is no valid bmp file at the given address\n"); - free(dst); - return(1); - } - - printf("Gzipped BMP image detected!\n"); -#else /* CONFIG_VIDEO_BMP_GZIP */ + if (bmp == NULL) { printf("There is no valid bmp file at the given address\n"); - return(1); -#endif /* CONFIG_VIDEO_BMP_GZIP */ + return 1; } + printf("Image size : %d x %d\n", le32_to_cpu(bmp->header.width), le32_to_cpu(bmp->header.height)); printf("Bits per pixel: %d\n", le16_to_cpu(bmp->header.bit_count)); printf("Compression : %d\n", le32_to_cpu(bmp->header.compression));
-#ifdef CONFIG_VIDEO_BMP_GZIP - if (dst) { - free(dst); - } -#endif /* CONFIG_VIDEO_BMP_GZIP */ + if ((unsigned long)bmp != addr) + free(bmp);
return(0); } @@ -174,14 +191,33 @@ static int bmp_info(ulong addr) */ static int bmp_display(ulong addr, int x, int y) { + int ret; + bmp_image_t *bmp = (bmp_image_t *)addr; + unsigned long len; + + if (!((bmp->header.signature[0]=='B') && + (bmp->header.signature[1]=='M'))) + bmp = gunzip_bmp(addr, &len); + + if (!bmp) { + printf("There is no valid bmp file at the given address\n"); + return 1; + } + #if defined(CONFIG_LCD) extern int lcd_display_bitmap (ulong, int, int);
- return (lcd_display_bitmap (addr, x, y)); + ret = lcd_display_bitmap ((unsigned long)bmp, x, y); #elif defined(CONFIG_VIDEO) extern int video_display_bitmap (ulong, int, int); - return (video_display_bitmap (addr, x, y)); + + ret = video_display_bitmap ((unsigned long)bmp, x, y); #else # error bmp_display() requires CONFIG_LCD or CONFIG_VIDEO #endif + + if ((unsigned long)bmp != addr) + free(bmp); + + return ret; }